{"id":190580,"url":"https://alion.io/job/motorway-senior-generative-ai-engineer","title":"Senior Generative AI Engineer","company":{"id":4269,"name":"Motorway","domain":"motorway.co.uk","url":"https://alion.io/company/motorway","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":null},"role":"AI/ML","role_family":"AI/ML","seniority":"senior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["London, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":105000,"max_usd":187000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":49},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agentic Workflows","optional":false},{"name":"AI Agents","optional":false},{"name":"AWS","optional":false},{"name":"CI/CD","optional":false},{"name":"Function Calling","optional":false},{"name":"GCP","optional":false},{"name":"Hallucination","optional":false},{"name":"LLM","optional":false},{"name":"LLM Guardrails","optional":false},{"name":"Machine Learning","optional":false},{"name":"Python","optional":false},{"name":"SQL","optional":false},{"name":"Structured Outputs","optional":false}],"status":"live","first_seen_at":"2026-09-02T11:34:02Z","employer_posted_date":"2026-09-02","last_verified_at":"2026-11-01T03:20:37Z","board_verified":true,"closed_at":null,"days_open":59,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":59},"description":"About Motorway\nMotorway is the UK's largest online car-selling platform. We connect private sellers directly with over 8,000 dealers nationwide. Our online platform helps sellers achieve great prices for their cars while giving dealers fast, reliable access to the stock they want for their dealerships. Founded in 2017, our award-winning, technology-led approach has redefined the experience of selling a car. Motorway is backed by some of the world’s leading technology investors, having raised £143 million in Series C funding.\nThis is a unique opportunity to join a fast-growing scale-up at a crucial phase of growth and help change an industry for the better.\nAbout the team\nGenAI Engineering sits within Motorway's Data and AI function, alongside Machine Learning and the Machine Learning Data Platform. We own the AI features that shape how buyers and sellers experience the marketplace, from agentic workflows in the customer journey to LLM-powered tooling for our dealer network.\nWhat we build goes into the hands of real sellers and thousands of verified dealers, usually within weeks. When it works, someone sells their car more easily. When it doesn't, we hear about it. That feedback loop is short, and it shapes how we work. We have a track record of successful deployments and a strong reputation as a result.\nAbout the role\nWe're looking for a Senior GenAI Engineer to build AI applications and agentic workflows for Motorway, taking them from rapid prototype through to production-grade systems that deliver measurable value.\nYou'll take a problem that isn't fully defined yet and see it through to a reliable system running in production: the prompting, the retrieval, the agent design, the evals, the guardrails, the monitoring. You own that whole stack. There's no separate team who \"productionises\" your work later.\nMost of what makes a GenAI feature good sits around the model rather than in it. The prompting is rarely the hard part. Retrieval quality is, and so is the data feeding it, evaluation you can trust, sensible behaviour when things fail, and getting it live and keeping it there. If that's the work you want to do, we're not precious about the route you took to get here. Some of us came through data science and machine learning and deliberately built up our software engineering; others came the other way.\nIn this role, you will:\nOwn AI features end to end, from an ambiguous problem through to a reliable, observable system that real customers depend on.\n\nBuild the retrieval and data foundations these features stand on, and treat retrieval quality as a first-class engineering problem rather than a tuning exercise.\n\nDesign evaluation and monitoring approaches that make quality, reliability and safety measurable rather than assumed.\n\nBuild AI applications and agents using LLMs, orchestration, APIs and data systems, applying solid production software practices throughout.\n\nMake the calls on models, cost and latency that shape what a feature costs us to run, and document the reasoning so others can follow it.\n\nPrototype quickly, work out what is reusable, and harden the patterns that work into components the rest of the team adopts.\n\nRaise the quality of the work around you through code review, design feedback and the standards you set by example.\n\nRepresent your technical decisions directly to product managers and stakeholders, translating model behaviour into business consequence.\n\nAbout you\nYou've shipped AI or ML systems that real users depend on, and you've stayed close enough to production to know how they behave when they break.\n\nStrong Python, and SQL you genuinely use. A lot of this work is data work: assembling grounding data, building golden datasets, and digging into why something failed.\n\nYou've invested deliberately in your software engineering craft: testing, error handling, CI/CD, observability, and the MLOps practices that keep things healthy once they're live.\n\nYou're hands-on across the GenAI stack: LLM APIs, retrieval and vector stores, agents with tool use, and structured outputs, running on cloud infrastructure (we use AWS and GCP).\n\nYou have a real point of view on evaluation, most likely because you've been caught out by a system that looked fine and wasn't.\n\nYou can reason about how models fail, including hallucination and prompt injection, and what that means for someone who trusts the output.\n\nYou know when to reach for a model, when something simpler will do, and when to stop.\n\nYou're a constructive reviewer, and colleagues are better off for having worked alongside you.\n\nYou could be a great fit if\nYou're curious about how things actually work, and you follow that curiosity past the first plausible answer.\n\nYou're drawn to problems where the right approach isn't obvious yet.\n\nYou're honest about the limits of what you know and pull people in early rather than late.\n\nYou take responsibility for what you ship, watch how it behaves, and fix it when it breaks.\n\nYou get satisfaction from the unglamorous work that makes an AI feature actually good, not just the part that demos well.\n\nYou can disagree well, and commit once a decision is made.\n\nBenefits\nWe've got your back, in life's biggest moments and the everyday ones too.\nCompetitive salary\n\nEquity scheme - we all share in Motorway's success\n\n25 days holiday\n\nFlexible working (2 days a week in our London office, with socials and snacks galore)\n\nPrivate medical insurance via BUPA\n\nLife assurance\n\nPension scheme (we contribute 5%)\n\nEnhanced family leave (e.g. 26 weeks full pay for maternity or adoption)\n\n24/7 Employee Assistance Programme\n\nEV leasing scheme\n\nCycle to work scheme\n\nNursery salary sacrifice scheme\n\n1 paid volunteering day a year","description_format":"text","description_chars":5713,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Equity","Flexible schedule","Health insurance","Parental leave"],"hiring_locations":[{"name":"United Kingdom","iso":"GB","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Marketplaces"],"lifecycle":[{"event":"open","at":"2026-09-02T13:23:18Z"}],"visa":[{"country":"GB","licensed_sponsor":true,"evidence":"Licensed UK visa sponsor (Skilled Worker)","filings_12m":null,"filings_prev_12m":null,"green_card_filings_12m":null,"median_offered_wage_usd":null,"route":"Skilled Worker","cap_exempt":false,"checked_at":"2026-10-31T06:23:40+00:00","sources":["UK Home Office: register of licensed sponsors (workers)"],"filings_for_role_12m":0}],"liveness":{"score":30,"band":"fade","label":"Fading","p_open":1,"p_active":0.675,"p_room":0.45,"age_days":58,"expected_fill_days":32,"reasons":["conf:0","win:tail"],"computed_at":"2026-10-31T05:58:55Z"},"pay":null,"html_url":"https://alion.io/job/motorway-senior-generative-ai-engineer","json_url":"https://alion.io/job/motorway-senior-generative-ai-engineer.json","meta":{"generated_at":"2026-11-01T05:36:12Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":8621,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-02T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":4269},"rest":"https://alion.io/mcp/rest/get_company?id=4269"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fmotorway-senior-generative-ai-engineer"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fmotorway-senior-generative-ai-engineer"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fmotorway-senior-generative-ai-engineer"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/motorway-senior-generative-ai-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fmotorway-senior-generative-ai-engineer"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":190580}},{"tool":"search_jobs","arguments":{"company":"motorway.co.uk","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":190580},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. 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